Tension for loom shuttles



R. G'. TURNER y TENSION FOR Loou SHUTTLES Filed Nov. 6. 1948 1 Aug; 15,`195o` INVENTOR RICHARD G. TUR/VER ATTORNEY Patented Aug. 15, 1950TENSION FOR LOOM SHUTTLES Richard G. Turner, Worcester, Mass., assignorto Crompton & Knowles Loom Works, Worcester, Mass., a corporation ofMassachusetts Application November 6, 1948, Serial No. 58,735

8 Claims.

` These pads may take the form of vertical members mounted for a limitedamount of motion relatively to the shuttle and constructed with verticaledges which in the past have been substantially straight. When theshuttle is checked near the end of its night the pads because of themanner of their mounting and because of their momentum move angularlywith respect to each other and pinch the weft thread sufliciently tocause breakage.

It is an important object of the present invention to form the pads withpart of their vertical edges cut back slightly to avoid pinching of theweft when the pads move angularly with respect to each other.

With these and other Vobjects in View which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein two forms oi the invention areshown,

Fig. 1 is a plan view of one end of the shuttle having the preferredform of the invention applied thereto, l

Fig. 2 is an enlarged transverse vertical section on line 2-2 of Fig. 1,

Fig. 3 is a detailed horizontal section on line 33, Fig. 2,

Fig. 4 shows the pads in horizontal section and indicates two differentpositions which they assume during running of the shuttle,

Fig. 5 is a perspective view of one of the pads,

Fig. 6 is a view similar to Fig. 4, but showing the modied form of theinvention, and

Fig. 7 is a side elevation looking in the direction of arrow 1, Fig. 6.

AReferring particularly to Fig. 1, the shuttle S carries a bobbin B theweft W of which unwinds from the bobbin and passes through a threadon asupport pin I6 fixed to the threader block II. The upper end of each padis formed with a lateral extension or nger I'l which ts into an openingI8 in the threader block. The finger I'I does not fully occupy theopening I8 and permits some freedom of motion of the upper end of thepad.

Each pad is urged toward the other by a light compression spring 20backed up by a screw 2l threaded into the block II, and each pad isprovided with a substantially at vertical weft engaging surface 22 alongwhich the thread moves horizontally or longitudinally of the shuttlewhen the latter is in flight.

As will be understood from Fig. 2 the extension or linger I1 of each padis located at one side of a vertical line passing along thecorresponding iiat surface 22, and when the shuttle is checked near theend of its iiight the nger I'I by reason of its momentum produces aslight rocking or angular movement of the pad. This rocking occurs withrespect to both pads and the latter momentarily move from the full lineposition to the dotted line position shown in Fig. 4. In the past thesepads have had continuous vertical straight edges adjacent to each other,and when the pads pivot on each other around their vertical edges asaxes the edges pinch the weft and weaken it so that it is likely tobreak.

The matter thus far described is of usual construction and operates inthe usual manner, the springs 20 determining the amount of frictionalcontact which the pads have with the weit thread and the pads beingmounted freely so they can move angularly when the shuttle is checked inits flight.

In carrying the present invention into effect provision is made toprevent the angular movement of the pads from cutting the weft. Thisresult is accomplished by remo-ving a part of the vertical straightedges heretofore used. The drawings show two means Yfor carrying theinvention into effect, but the invention is not necessarily limited tothe two forms shown in Figs. 4 and 6.

Referring particularly to Figs. 4 and 5, and considering one side of oneof the pads, it will be seen that pad I 3 has an upper straight primaryedge 30 which is more or less in vertical alignment with a lowerstraight primary edge 3I. These two edges or parts of pad I3 are spacedfrom each other by a 10W area or portion 32 which may be produced bychamfering the edge of the pad between the edges 3u and 3l. The effectof this chamfering is to produce a secondary edge 33 for the pad whichis spaced from' a line joining the edges30 and 3l in the direction ofthe length of travel of the thread. Both sides of both pads are formedas already described, but the invention will operate if only one pad hasits edges chamfered.

While the shuttle is in night the two pads Will be in the positionsshown in full lines in Fig. 4, but when the shuttle is checked, as byengagement with the shuttle binder, the guide nngers Il due to theirmomentum' tend to move in the direction of shuttle travel faster thanthe'shuttle is traveling. This causes the pads to rock to the dottedline positions shown in Fig. 4. During this rocking the pads pivot onthemselves by engagement of their upper and lower primary edges 3U and 3I, respectively, but during this pivoting the secondary edge 33 of thechamfer of one pad moves away from the similar edge 33 of the other pad,thereby denning a small open space 38 through which the thread can move,and there is no opportunity for the thread to be pinched or broken.

In the modined form of the invention shown in Figs. 6 and 7 the primaryvertical edges 4B and 4l correspond to the vertical edges 3!'and 3| ofthe preferred form, but the sides of theI pad are cut back as at G2 toprovide secondary edges 43 similar to edges 33 of the preferred form.The operation of the modified formis substantially the same as that. ofthe preferred form, as will be understood from Fig. 6, where the fullposition of the two padsis that existing while the shuttle is in fullnight and wherein the dotted lines indicate the rocked position of thepads when the shuttle is checked. In the modined form the edges 53 whichdetermine one of the horizontal limits of the surface which engages thethread moves away from the corresponding edge 43 of the other pad and asmall opening is denned for the thread.

The pads are free to move angularly with respect to each other wheneverthe shuttle is checked, whether it be moving to the right'or left acrossthe loom and both vertical edges of each pad will be modified as setforth hereinbefore so that whether the pads rock from the full to thedotted line position shown in Fig. 4, or whether they rock in theopposite direction due to the fact that the shuttle is-moving reversely,they will nevertheless separate to open a sm'all gap through which theweft can pass without being pinched.

From the foregoing it will be seen that the invention sets forth atension pad for a loom shuttle constructed in such manner that angularmovement of the pads with respect to each other and about an axisdetermined by mutual engagement of parts of the pads will effect aseparation of those parts of the pad across which the weft passes. Thisresult can be accomplished either by chamfering the edges of the pads asin the preferred form of the invention, or by removal of a small part ofthe sides of the pads as in the modified form of the invention.

Having thus described the invention it will' be seen that changes andmodincations of the foregoing specinc disclosure may be made withoutdeparting from' the spirit and scope of the invention.

What is claimed as new is:

1. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, said pads having adjacent verticaledges around which the pads have angular movements when the shuttle ischecked in its night, and said pads having nat weft engaging faces whichterminate out of vertical alignment with said edges and move apart todenne a space for the thread when the pads have said angular movements.

2. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, said pads having upper and lowerengaging parts around which said pads have angular movements when theshuttle is checked near the end of its travel, said pads having portionsthereof between said parts which move away from each other to denne aspace for passage of the weft when the pads have said angular movements.

3. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, at least one of said pads havingupper and lower parts engaging the other pad and having an angularmovement around said parts when the shuttle is checked in its night,said one pad having a portion thereof between said parts which movesalway from the other pad to denne a space for the weft when said onepad` has said angular movements.

4. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, each pad having vertically spacedvertical edges adjacent to similar edges on the other pad and the padshaving angular movements around said edges when the shuttle is checkednear the end of its night, each pad having a nat thread engaging surfaceand the pads being so formed that the parts thereof engaging the weftmove apart to denne a space for the thread when the pads have saidangular movement.

5. In weft tension mechanism. for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, said pads having adjacent verticaledges and having weft engaging faces which terminate at points spacedlongitudinally of the shuttle from said edges, said pads having angularmovements about said edges when the shuttle is checked-in its night andthe faces of the pads moving apart to denne a space for the weft whenthe pads have said angular movements.

6. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair `of vertically extendingtension padsV mounted on the block, at least one of said pads having aprimary edge below the path of travel of the thread through the threaderblock and having a weft engaging face terminating in a secondary edgeabove said primary edge and spaced from the latter longitudinally of theshuttle, said one pad having an angular movement around said primaryedge when the'shuttle is checked in its night and the secondary edgemoving away from the weft to avoid injury thereto.

'7. In weft tension mechanism for a loom shuttle having a threader blockwith a thread passage therethrough, a pair of vertically extendingtension pads mounted on the block, each pad having a primary edge belowthe path of travel` of the thread through the threader blockgand havinga vertically extending weft engaging face type having a threading blockmounted in one end thereof which threading block is provided with athread channel through which the lling yarn passes from the bobbin tothe outlet, and spring pressed tension members loosely mounted 6 in thethreading block and between which the lling yarn passes, said tensionmembers having their coacting faces shaped to provide relatively Wideportions at the top and bottom and a relatively narrow portiontherebetween.

RICHARD G. TURNER.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES pATENTS Name Date Kaufmann Oct. 29, 1946 Number

